Question

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Answer 1

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r = 25 cm = 0.25 m

r = 25 cm = 0.25 mh= 3.5 m

r = 25 cm = 0.25 mh= 3.5 m

C.S.A = 2π r h

r = 25 cm = 0.25 mh= 3.5 m

C.S.A = 2π r h= 2 ×22/ 7 ×0.25 × 3.5 = 5.5 m²

cost of surface of the pillar = 5.5× 12.50 = Rs 68.75

right answer is

option A》 68. 75